i think 88 and up K5 blazers were changed to V10 (V was like fullsize 4x4 and the 10 was for half ton). 87 and before were K5s (K being fullsize 4x4 and 5 for halfton SUV)...its all the same thing tho, they were just changed when GM introduced the new IFS rigs...

Now the v thing started with 1988 , because the new IFS trucks got c/k designations , and that left the old style trucks with the new letters

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Correction: The "V" thing started in 87. Same year the the tbi was introduced to the blazer/jimmy. So to answer the initiel question, yes your 87 K5 is technically a "V10 Blazer." So when you go to the parts store and they ask you what it is, their computer screen will say "V10 Blazer 4wd" instead of K5 Blazer.
-Harrison

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